US4508638A - Agent and method for the stabilization of polyvinyl chloride against heat and light - Google Patents
Agent and method for the stabilization of polyvinyl chloride against heat and light Download PDFInfo
- Publication number
- US4508638A US4508638A US06/480,175 US48017583A US4508638A US 4508638 A US4508638 A US 4508638A US 48017583 A US48017583 A US 48017583A US 4508638 A US4508638 A US 4508638A
- Authority
- US
- United States
- Prior art keywords
- water
- dicyandiamide
- agent
- polyvinyl chloride
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/10—Metal compounds
Definitions
- the present invention relates to an agent and method for the stabilization of polyvinyl chloride against heat and light, on the basis of dicyandiamide.
- melt mixture whose melting point is below the fabrication temperature of the polyvinyl chloride.
- a melt mixture can consist, for example, of aminobenzenesulfonic acid amide and dicyandiamide in accordance with DD Pat. No. 28,349, but yellow discoloration cannot be avoided in this manner.
- Dicyandiamide is also used together with other stabilizers, such as for example pentaerythritol or dipentaerythritol, in the manufacture of asbestos-filled floor coverings (cf. GB No. 985,405), or with triazine compounds such as melamine, alkylmelamines, phenylmelamine or benzoguanamine in accordance with U.S. Pat. No. 3,194,786.
- the disadvantage of all these known stabilizer mixtures consists in the fact that the thermal stability of the manufactured PVC products is limited, and at temperatures above 150° C., i.e., at the usual fabricating temperatures, the thermal stability diminishes very greatly, causing considerable discoloration in the PVC products.
- This aim is achieved in accordance with the invention by using dicyandiamide with a content of 0.5 to 7 equivalents of water and/or compounds containing water and/or compounds yielding water by cleavage, with respect to the amount of dicyandiamide.
- dicyandiamide with a content of 0.5 to 7 equivalents of water and/or compounds containing water and/or compounds yielding water by cleavage, with respect to the amount of dicyandiamide.
- 0.5 to 7 moles of water are added as such or in releasable form.
- the stabilizers of the invention are suitable for all kinds of PVC products, such as powders, boards, films, extruded shapes, tubes, etc., and for both soft and hard PVC products.
- the fillers can be conventional fibrous substances such as asbestos and mineral wool or other additive materials, especially inorganic compounds such as CaCO 3 , CaSO 4 , BaSO 4 , SiO 2 , calcium silicate, kaolin, china clay, magnesium silicate or pigments such as TiO 2 , Fe 2 O 3 , and PbCrO 4 .
- Suitable water-containing substances are any of the inorganic salts containing water of crystallization, as long as they are colorless or have little color of their own and do not destabilize PVC. Examples are: ZnSO 4 .7H 2 O, Na 2 SO 3 .7H 2 O, CaSO 4 .2H 2 O, K 2 CO 3 /Na 2 CO 3 .6H 2 O, K 2 Mg(SO 4 ) 2 .6H 2 O, Na 2 B 4 O 6 .10H 2 O, Na 3 PO 4 .12H 2 O, Na 2 S 2 O 3 .2H 2 O, KA1(SO 4 ) 2 .12H 2 O, especially FeSO 4 .7H 2 O or NiSO 4 .6H 2 O.
- Substances yielding water by cleavage can be, for example, any of the metal hydroxides, aluminum hydroxide and magnesium hydroxide having proven especially advantageous, or superbasic metal carboxylates such as calcium stearate.calcium hydroxide, for example. Also usable are univalent metal hydroxides capable of yielding intermolecular water or of reacting with evolving HCl to form water and chloride.
- the substances which contain water and/or substances yielding water by cleavage can be added in finely ground form, together with the dicyandiamide and other additives, to the PVC powder before these components are intensively mixed together, the grain size being best between 1 micron and 75 microns, and amounting preferably to from 2 to 20 microns, or they are admixed with the stabilizer mixtures containing dicyandiamide. Then the PVC compositions can be fabricated by the usual methods.
- This stabilizing agent is the improved thermal stability up to temperatures of 200° C., making it possible to perform more rapidly and easily such thermal fabricating processes as calandering or gelling.
- a mixture of 100 parts of PVC H 70 DF, 30 parts of phthalic acid ester (Palatinol R ), 1 part of wax (ground mixture) and 1 part of dicyandiamide as stabilizer is intimately mixed with 1 part of water and pressed at 175° C. to a film.
- the film thus obtained is characterized by substantially less initial inherent color than a film made in the same manner but without the addition of water.
- the film is distinguished by good transparency and light inherent color. When baked at 175° C., not until after 45 minutes does a slight brownish color develop.
- a film prepared for comparison without the addition of ZnSO 4 .7H 2 O is cloudy and turns brown after 40 minutes.
- a ground mixture in accordance with Example 1 is thoroughly mixed with stabilizer consisting of 1 part of dicyandiamide and 0.3 parts of FeSO 4 .7H 2 O and pressed to a film at 175° C.
- the film has a slight yellowish color which nevertheless does not change with exposure to heat at 175° C. for 60 minutes.
- the film made for comparison without the addition of FeSO 3 .7H 2 O is blackish brown after 60 minutes.
- a ground mixture in accordance with Example 1 is thoroughly mixed with 1% by weight of a stabilizer consisting of one part of dicyandiamide and one part of NiSO 4 .7H 2 O, and pressed to a film at 175° C.
- the film has a slightly yellowish color which nevertheless does not change with exposure to heat at 175° C. for 60 minutes.
- a mixture in accordance with Example 1 is mixed with one part each of dicyandiamide and Ha 2 SO 3 .7H 2 O and pressed to a film at 175° C.
- the film has a very faint inherent color. After 60 minutes of exposure to heat at 175° C. a slight yellowing is observed.
- a mixture in accordance with Example 1 is mixed with 1% by weight each of dicyandiamide, sulfanilamide and Na 2 SO 3 .7H 2 O and pressed to a film at 175° C.
- the clear, transparent film yellows slightly after 60 minutes' exposure to heat at 175° C.
Abstract
Description
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3212336A DE3212336C1 (en) | 1982-04-02 | 1982-04-02 | Means and methods for heat and light stabilization of polyvinyl chloride |
DE3212336 | 1982-04-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4508638A true US4508638A (en) | 1985-04-02 |
Family
ID=6160101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/480,175 Expired - Fee Related US4508638A (en) | 1982-04-02 | 1983-03-29 | Agent and method for the stabilization of polyvinyl chloride against heat and light |
Country Status (2)
Country | Link |
---|---|
US (1) | US4508638A (en) |
DE (1) | DE3212336C1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100209343A1 (en) * | 2009-02-17 | 2010-08-19 | Cornell Research Foundation, Inc. | Methods and kits for diagnosis of cancer and prediction of therapeutic value |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3975357A (en) * | 1973-04-19 | 1976-08-17 | Sankyo Company Limited | Stabilized synthetic polymer compositions |
US4009137A (en) * | 1973-11-30 | 1977-02-22 | Hoechst Aktiengesellschaft | Intumescent flame-retardant coating compositions |
US4182698A (en) * | 1978-05-03 | 1980-01-08 | The Firestone Tire & Rubber Company | Heat stabilized polyvinyl chloride dispersion resins |
-
1982
- 1982-04-02 DE DE3212336A patent/DE3212336C1/en not_active Expired
-
1983
- 1983-03-29 US US06/480,175 patent/US4508638A/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3975357A (en) * | 1973-04-19 | 1976-08-17 | Sankyo Company Limited | Stabilized synthetic polymer compositions |
US4009137A (en) * | 1973-11-30 | 1977-02-22 | Hoechst Aktiengesellschaft | Intumescent flame-retardant coating compositions |
US4182698A (en) * | 1978-05-03 | 1980-01-08 | The Firestone Tire & Rubber Company | Heat stabilized polyvinyl chloride dispersion resins |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100209343A1 (en) * | 2009-02-17 | 2010-08-19 | Cornell Research Foundation, Inc. | Methods and kits for diagnosis of cancer and prediction of therapeutic value |
Also Published As
Publication number | Publication date |
---|---|
DE3212336C1 (en) | 1983-12-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SKW TROSTBERG AKTIENGESELLSCHAFT DR.-ALBERT-FRANK- Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VON SEYERL, JOACHIM;REEL/FRAME:004314/0212 Effective date: 19830316 Owner name: SKW TROSTBERG AKTIENGESELLSCHAFT A CORP OF WEST GE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VON SEYERL, JOACHIM;REEL/FRAME:004314/0212 Effective date: 19830316 |
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LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19970402 |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |